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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 502 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.31 + 57 =
  2. 2.57 + 47 =
  3. 3.45 + 89 =
  4. 4.85 + 17 =
  5. 5.245 + 28 =
  6. 6.399 + 48 =
  7. 7.270 + 39 =
  8. 8.326 + 67 =
  9. 9.171 + 48 =
  10. 10.102 + 29 =
  11. 11.50 + 47 =
  12. 12.142 + 38 =
  13. 13.320 + 28 =
  14. 14.419 + 68 =
  15. 15.441 + 17 =
  16. 16.313 + 59 =
  17. 17.203 + 19 =
  18. 18.398 + 59 =
  19. 19.172 + 58 =
  20. 20.51 + 29 =
  21. 21.378 + 87 =
  22. 22.253 + 19 =
  23. 23.389 + 48 =
  24. 24.232 + 17 =
  25. 25.260 + 18 =
  26. 26.203 + 38 =
  27. 27.334 + 38 =
  28. 28.93 + 69 =
  29. 29.28 + 29 =
  30. 30.88 + 69 =
  31. 31.151 + 28 =
  32. 32.144 + 77 =
  33. 33.418 + 38 =
  34. 34.215 + 98 =
  35. 35.42 + 77 =
  36. 36.150 + 37 =
  37. 37.439 + 57 =
  38. 38.104 + 58 =
  39. 39.437 + 28 =
  40. 40.105 + 88 =

Answer key

  1. 88
  2. 104
  3. 134
  4. 102
  5. 273
  6. 447
  7. 309
  8. 393
  9. 219
  10. 131
  11. 97
  12. 180
  13. 348
  14. 487
  15. 458
  16. 372
  17. 222
  18. 457
  19. 230
  20. 80
  21. 465
  22. 272
  23. 437
  24. 249
  25. 278
  26. 241
  27. 372
  28. 162
  29. 57
  30. 157
  31. 179
  32. 221
  33. 456
  34. 313
  35. 119
  36. 187
  37. 496
  38. 162
  39. 465
  40. 193

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